Clamping device



5. H. MCCOWAN Feb. 2 1926.

CLAMPING DEVICE Filed April 11, 1925 WMU@ W w H. 5

Patented Feb. v2, 1926.

unirse srarifzs ,SAMUEL n. McGowan, orA GREENWAY, AnKANsns.

onAMrrNG DEVICE.

.Application filed April 11, 1925. Serial No. 22,315.

A.To all who/n t mcj/ Concern.'

fBe 'it iknown that I, SAMUEL H. Mo-

*Coivnm a citizen of the United States, residf ing at Greenway, in the county of Clay and State yof Arkansas, have invented certain new and useful Improvements in Clamping Devices, of which the following is a speciication.

This Ainvention relates to clamping deH vices and is intended more particularly for securing the shank or beam of a cultivator shovel in the crosshead carried by the cultivator beam. The object of the invention is to provide a very simple, inexpensive and secure fastening which will minimize the strain upon the bolt and nut and will be so formed that the thrust or pull upon the cultivator shovels and their shanks or beams will serve to make the fastening more secure. The invention is illustrated in the accompanying drawing and will be hereinafter fully set forth.

ln the drawing:

Figure 1 is a perspective view of a portion of a cultivator having my invention embodied therein;

Fig. 2 is a horizontal. section through the crosshead., and y Fig. 3 is a detailview of an end of the cultivator shank or beam and of the clamp-- ing bolt.

The cailtivator beam 1 may be of any nidi-known type and the'crosshead 2 is secured to the rear end of the beam in the usual manner. lt has heretofore been proposed to construct the crosshead with openings 3 through their end portions` which openings have one vertical fiat longitudinal wail and also have an opposed wall. presenting an obliquely disposed portion 5. 'the obliquely disposed portion 5 may eX- 'Loud from top to bottoni of the crosshead or 'from front 'to rear. thereof so that the 'crosshead is adapted to receive a hori` Zontallv extending shovel, beam or shank, as sho iin at or a vertical shank, as indicated at 7. In carrying out my present hivention, the shank 6 or 7, as the case may be. is provided in its lateral face with one orl more recesses or seats 8 which may be engaged by a teat 9 on the flat face 1Q of the enlarged head 11 of the securing bolt.

The bolt has a shank 12 which is adapted to entend through the'ivopening 3 in the crosshead and receive washer 13 and a mit 14 Upea its rear @afl with Serv@ t@ cooperate with the rear side of the .cross head 4to Aclamp the bolt or key in place. The threaded shank 12 of the bolt or key is obviously of less diameter than the head 1l so that it will be spaced from the shank or beam 6 a suiiicient distance to accommodate the nut and washer. The head is disposed walls 5 of the opening 3 so that,

,when the nut is turned home, a wedging binding action between the bolt and the wall of the opening will be effected.

The seats or recesses 8 are provided in both side faces of the shank or beam 6 so that the shank or beam may be disposed aga-inst either flat end wall 4 of the open ing, it being noted that the inclined walls 5 are formed upon inner projections 16 of the walls of the crosshead and a passage or slot 17 being formed between these projections to accommodate the shank 12 of the key or bolt. The teat 9 on the head of the securing bolt, being engaged in the seat in the side of the shovel, beam. or shank, will eect a` positive engagement with the said shank so that relative movement between thev shank and the key or bolt will be prevented, and when the key is turned home by manipulation of the nut, the beam will be very securely clamped against the end wall of the opening through the crosshead. The thrust or strain upon the shovel is, of course, carried by the shovel shank or beam and tends to move the beam.i rearwardly through the crosshead, resulting, in my device, in increasing the binding action between the diagonally disposed faces of the bolt head and the inclined walls of the opening through the crosshead so that the greater the strain upon the. cultivator shank the more firmly will it be held. A great diificulty in similar devices heretofore employed has been found to exist in that the nuts had to be turned fully home and the strength of the clamp depended upon the extent to which the nut was driven home. Through continued use, the threads of the nut or the bolt were stripped and the opposed faces of the cultivater shank or beam and the securing bolt worn smooth so that the shank would not be held Vfirmly but would slip and frequently `drop from the crosshead. ln my device, it is not necssary to turn the nut tightly home and` the interlocking engagement bet/Ween the holt heed und the :shank lni'nislied by the tent on the holt head :1nd the seat in the lzii'ei'iil fece of the shank positively und e'ieetnidly prevent ielati\'e slipping ino\'e menti between *diese pfuie. The device exceedingly siinpie und inexpensive and may he ensilj1 applied to existingY euliivatol's.

Having time described the invention, l elniin:

The combination oi.l a eiosshead having; an opening' iiiieietln'mig'l1` said openingv having; n 'dat end will and having; obliqnely disposed walls opposed to Suid end will with :in open space between Seid obliqnely dis posed walls, n shank inseiiihle through [he opening in die oi'osshezid to beni' nggninhl' the flat wall of the sinne and provided in its lateral face with n recess, and a boli having :i shank eriteiiding between the obliqneiy disposed Walle, of the opei'iing,l in the eiossliend and an enlarged head p1ovided Wil-h oblionely disposed faces adapted to engnez-x he obliqnely disposed Walls und yn'ejeetmn on one side of the head engaging the sont in the lateral linee of the SAM H. MGCOVAN. V[L 

